Broadcasting mobile ring tone - is there a way?

[Mr Curta]

I remember those rings across a floor. But if it was similar to the environment I remember there were phones everywhere and you just had to pick up the phone and switch the line.

This sounds like a 'Night Bell Call Pickup' feature which permits alternate routing of inbound calls to a Call Pickup Group so that everyone in the building can hear the alerting call and answer it from any instrument. Sometimes there were additional ringers plugged into Line Jack Units at strategic locations.